Warp stop motion for looms



May 7, 1929. EG N 1,711,617'

WARP STOP MOTION FOR LOOMS Filed June 21, 1927 fvvz-A/To/P 75H REGAN Ill) Patented May 7, 1929.

UNITED STATES" PATENT JOHN REGAN, or new BEDFORD, MASSACHUSETTS, ASSIGNOR To onomr'ron &

inter? OFFICE.

KNOWLES-L001 WORKS, OF WORCESTER, LTASSACHiUSETTSyA CORPORATION OF MASSACI-IUSETTS.

Application filed June 21,

These decorative threads are very fine and are ordinarily unable to support the kind of drop wires which are used for the relatively stronger. and coarser worsted yarns and I have found that attempts to mix two weights of drop wires in the same bank or group does not give satisfactory results. The reason for this is that the space between the separator bars against which the drop wires are moved at the time of indication of warp fault is made relatively wide for the heavier .drop wires and this space is found to be so wide that the lighter and narrower drop wires have suflicient'lost motion before engaging one of the separator bars to prevent operation of the motion. It is an important object of my present invention to group all of the finer and lighter drop wires in one bank and provide separator barsfor this bank which are closer together than are the separator bars of the main part of the warp sto p motion.

VVhcn'aknock-ofl motion of the type set forth in. patent to Holmes No. 1,360,638 is employed the tensionon the yielding'spring is set to operate'satisfactorily with the heavicr drop wires but I find that a pressure sat-- isfactory for the drop wires on the worsted 3 yarns is too great for the lighter drop wires for silk yards and this is an additional reason why the separator bars for the drop wires on the silk yarns should be close enough to require the lighter drop wires to stop the loom when a silk thread breaks. 1f the relatively heavier pressure necessary for the larger drop wires were applied to the lighter drop wires and the latter were free to move in a relatively large space before engaging the separator bars the motion would operate unsatisfactorily when a fault occurred in the silk threads.

Vhen fine silk threads and "relatively coarse worsted yarns are wound ,onthe same beam the silk yarn, being of smaller diam-- eter will wind more closely so that a given cam on the, bottom shaft of the loom.

WARP sror ivrorion roR Loot/is.

1927. Serial No. 200,468.

length will occupy less space than is the case with the larger worsted yarns. The result of this is that in the lettingsoff of the beam there is an unevennessv in the tension of the silk and worsted threads. It is a further object of my present invention to provide a motion wherein all of threads may be subjected to a drop wire pressure different from that exerted on the coarser threads, the purpose being to tend to correct any unevenness of tension'which might result in the letting-off of the silk threads.

VVith these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth the claims. In the' accompanying drawings, wherein I have shown a convenient embodiment of my invention Fig' 1 is aside elevation of a portion of a warp stop motion having myinvention applied thereto, 1

Fig. 2 is a vertical section. taken through the warp stop motion looking from the rear of the motion as shown. in Fig. 1, and

Fig. 3 is a diagrammatic topplan of a the finer or silk portion of the motion showing'the'relation between the coarse and fine warp threads and the different types of drop wires supported thereby. 7

Referring .to Figs. 1 and 2 I have shown the operating or head end of a warp stop motion. having a frame 10 with an upstanding arm 11 in which is secureda stud 12. An actuating lever 13 is pivoted on-saidstud and is given a periodic oscillationby means of an upright connector 14 operated by any.

approved mechanism not shown such asa Said lever is provided with a knock-off hook 15 and is further provided with an arm 16in which is journaled gudgeon 17 of a swivel bearing 18. Freely extending therethrough is a rod '19 the lower end of which is U-shaped and extends upwardly to have connection at 20 with a small bell crank lever 21; Alight compression spring 22 is interposed between the swivel hearing 18 and a collar 23 adjustably secured to the rod 19.

The bell crank lever 21 has a downwardly depending arm 24 which has connection witlrone end of a horizontally extending: link 25. Said link has pivotal connection with a plurality of depending arms 26 and 29 and carries a pin 30 lying under the tail 31 of a dog 32 which is adapted for cooperation with the hook 15. Dog 32 is pivotally supported on a knock-off lever 33 pivoted on the stud 12 and connected by a knock-off rod 341 to stopping mechanism not shown. The links and bell crank lever 21 are'connected with non-circular oscillating detector rods to be described hereinafter. p

In operation lever 13 oscillates back and forth-about stud 12 and arm 16 will bear downwardly on compression spring 22 to lower the rod 19, said rod being loose with respect to the arm 16. So long downward movement of the rod is uninterrupted the link 25 will move to the left from the position shown in Fig.1 and indicator. link 27 will be rocked to raise pin 30 so that the right hand end of dog 32 will be depressed as the hook 15 moves to the left. Said hook will therefore have an idle movement and the knock-off lever 33 would remain at rest to permit continued running of the loom. Atthe time of a warp fault, however, the link 25 will be held against movement to the left and the pin 30, remaining in low position will leave dog 32 in the path of hook 15 and as the latter moves to'the left the knockoff lever 83 and rod 8% will be given a loom stopping movement. The matter thus far described is of common construction and may be as set forth in the aforesaid patent to Holmes but forms no part of my present invention.

My present invention relates to the arrangement of the drop wires so that the heavy wires which correspond to the relatively coarse yarn may be grouped together and the lighter drop wires which correspond to the finer decorative threads may also be grouped together apart from the heavier drop wires. In the particularform of in vention shown herein the bell crank lever-21 and the hills-5 26 have driving connections with oscillating detector rods 40 while the indicator link 27 has a driving connection with another oscillating detector rod 41. Said detector rods may be of substantially the same cross sectionxor if desired the rod 41 may be made slightly smaller than the rods 40. I

The drop wires for the relatively coarse threads W a e shown at 1-2 and are heavier 3 and wider than drop wires 4:3 used on the sllk warps S. All of the drop wires are provided with slots 14; the upper ends of which are restricted as at 45, said restricted ends of the slots cooperating with non-circular detector rods to prevent angular movement of the latter at the time of warp fault as set forth in my prior Patent No. 1 265412, reissued March 30, 1920, No. 14,829.

. adjacent rods 10.

It is customary in warp stop motions of the type set forth herein to employ so-called separator bars extending under the warp threads and serving to separate the drop wires into banks. As shown herein I have provided several separator bars, the one to the left indicated at 46 being relatively high and the three bars to the right thereof being indicated at 47 and being relatively lower. Another high separator bar 48 may be locatedto the right of the last low bar 47. These separator bars may be spaced horizontally to define between them equal spaces in which the lower ends of the larger drop wires l2 may extend. The separator bars cooperate with the drop wires and the oscillating detector rods to prevent movement of the latter when a drop wire is in fallen position. Another relatively high separator bar 49 is employed at the right hand side of the motion as viewed in Fig. 2 and defines with separator bar 48 a relatively narrow space for the lower ends of-the lighter and narrower drop wires 43.

In Fig. 3 I have indicated diagrammatically the relation of the separator bars,

warp threads and drop wires and in said figure I have represented the relatively coarse warp threads V and the finer warp threads at S as extending horizontally. Each of thecoarse threads will have a drop wire 4-2 thereon while each of the fine warp threads has one of the smaller drop wires 43. As shown clearly in Fig. 3 the lighter drop wires are grouped in one bank located between the separator bars 48 and 19, while the heavier drop wires are located in parallel banks and extend in the wider spaces between the remaining separator bars. It will be noticed by referring to Fig. 2 that the clearance between the edges of the small drop wires -il3 and the adjacent separator bars is sul'astantially the same as the clearance between the edges of the heavier drop wires a2 and the separator bars lying adjacent thereto, I find that as a matter of practical construction the oscillating rod 41 should be a little nearer the adjacent oscillating rod 40 than the distance between The separator bars ma y be supported by a bracket 50 held to the frame 10 and shown in detail in Patent No. 1,496,361. I

By the construction set forth herein 1 am able to segregate the lighter drop wires which rest on the finer yarns and provide a relatively smaller space between separator bars for said lighter drop wires so that they will be as effective in operating the warp stop motion as are the larger drop wires. As previously stated I found that when the smaller drop wires made necessary by the finer warp threads were placed in the same banks with the heavier drop wires there was so much space between the find it highly desirable to wires so that the light a light drop wire would remain edges of the small drop wires and the separator bars that said lighter detector did not operate to stop the loom satisfactorily. This defect could not be: corrected by applying heavier drop wires to the silk threads as the latter do not operate satisfactorily drop Wife and furthermore with the heavy the defectcould not be corrected by applying light drop wires to the heavier threads shall be in one bank and the heavier drop wires in the other bank. I find that the finer threads S operate better when the separator bar 48 is of the same height as the bar 49, these high bars supporting the finer yarnssoas 4-3 from falling into stopping respect to the detector rod 41.

From the foregoing it will be seen that I have provided a warp stopmotion wherem the relatively heavy drop wires are sepa rated from the liner and lighter wires and wherein the spring 22 can be set to operate ing ,warp tl'ircads,

cations may be made with equally satisfactory results Whether the heavy or the light drop" wires are in stopping position with respect to their oscillating detector rods. It will further be seen that the separator bars against which theilower ends of thedrop wires are moved at the time of a warp fault are given proper spacings so that the idle, motion of the drop wires before they engage the sepa'rator rods will be substantially the same irrespective of the type of drop wire -which may be indicating. Furthermore, the separator bars 128 and 49 serve to hold the drop wires 41-3 in proper position relatively to the detector rod ll. l Having thus described my invention it will be apparent that changes and'modifitherein by those skilled inthe art without departingfrom the sp and scope of the invention and I do not to be limited to the details herein disclosed, out what I clann is:

1. In a warp stop motion for looms havrelatively coarse and relatively fine relatively wide heavy drop wires for the coarse warp threads, narrow light drop wires for the finer warp threads, means to separate the lighter from the heavier drop wires, and a plurality of separator bars to separate said drop wires into banks, the clearance between the edges of the narrower drop wires and the adjacent separator bars being substantially the same group these drop and narrow ones to prevent the drop wires f position wlth 'ing relatively relatively relatively as the clearance between the ed es of-the wider drop wires adjacent thereto. 7

In a warp stop motion for looms having relatively coarse and" relatively tine warp threads, relatively light and narrow drop wires and the separator bars drop wires for the heavier warp threads arranged-1n another group, an oscillatlng detector rod for and to cooperate with an oscillating detector rod and a'fallen drop VVIIQ to arrest movement of the oscillating detector rod, the separator bars ad acent the groupof' lighter drop wires being nearer together than the separator bars lying adjacent the heavier group of drop wires. I f

3. In a warp stopmotiohfor looms ha v-V ing relativelycoarse and relatively fine warp threads, a group of light relatively narrow drop wires for the liner yarns, another group of heavier relatively for the coarse -warp threads, an oscillating detector rod for each vgroup 0t threads, a resilient driving means to oscillate sa d detector rods, and separator bars with the detectingrods, said defining a relatively group of narrower drop wires anddefiningseparator bars an'other relatively" wider space for the group of wider dropwires, said separator bars and I for the liner yarns arranged 111- one group, relatively heavier and Wider,

each group, separator bars 1 to hold the groups apart in spaced relation to cooperate narrow space for the wide drop wires oscillating detector rods cooperating with a'fallen drop wire to arrest 1 oscillation dot the corresponding detector red.

at. In a warp stop motion for looms'ham coarse and relat vely fine warp threads, a plurality otsepara'tcrbars dehning substantially parallel spaces, and certain of sai'dlbars being farthen apart than other or said bars to define spaces of varying widths, a group otrel-atively wide drop wires for the coarse warp threads, located in a relatively-widespace, another grouplof relatively narrow drop wires located in a narrow space, and oscillating means coo aeratin with'each bank of droo wires and the separator bars to stop the loom when any of the drop wires fall into engagement with the corresponding rod.

5. In a warp stop motion for looms having coarse and tine yarn, a set of relatively'heavy wide drop wires for the coarser yarns arranged in a group, a set of lighter narrow drop wires for the line yarns, arranged in another group, an oscillating detector rod for each group to be engaged by a fallen drop wire, ylelding late the detector rods, fixed stops against which the drop wires may move, said driv means yielding when a drop wire is in fallen position in engagement with the corresponding' oscillating detector red but said driving means moving the drop wire against ing relatively coarse the fixed means, the amount of movement given any of the drop wires to bring the same into engagement with fixed stopping means being substantially the same.

6. In a warp stop motion for a loom having relatively coarse and fine yarns, a set of relatively heavy drop wires arranged in a plurality of groups, one relatively heavy dro wire being for each coarse thread, a set of light drop wires for the fine threads being arranged in a group separate from the drop wires of the coarse threads, a pair of relatively high separator bars defining! a space for the light drop wires, a set of separator bars certain of which are high and certain of which are low to define spaces for the drop means to stop the loom when any of the drop wires tall. 7 v

7. In a warp stop motion for a loom having relatively coarse and fine yarns, a plurality of sets of relatively heavy drop wires arranged in a plurality of groups, one relatively heavy drop wire being for each coarse thread, a set of light drop wires for the fine threads arranged in a group separate from the drop wires of the coarse threads, a pair of relatively high separator bars defining a space for the light drop wires, a set of separator bars certain otwhich are high and certain of which arelow to define spaces for the drop wires of'the coarse yarns, the separator bars being so disposed that the lighter drop wires are at one side of the motion and the coarser drop wires at the other side, and means to stop the loom when any or" the drop wires fall. a

8. In a warp stop motion for looms havand relatively fine warpthreads', a group of relatively wide dropwir'es for the coarse warp threads, a separate group of relatively narrowv lighter drop wires for the finer warp threads, means to separate the narrower drop wires from the wider'drop wires, all the drop wires having wires of the coarse yarns, and

slots therein with a restricted upper portion,

a non-circular oscillating detector rod passing through the slots and engageable by the restricted portion of the slot of a fallen drop wire, said rod moving a fallen drop wire against the meansto cause deflection of a fallen drop wire when moved against the means, and means to stop the loom when any of the drop wires fall. 1

' 9. In a warp stop motion for a loom having relatively coarse and fine yarns, a set of relatively heavy and inflexible drop wires arranged in a group for the coarse yarns, another set of relativelylight and flexible drop wires arranged in another group for the fine yarns, separator bars for the heavy drop wires certain of which are relatively high and others of which are relatively low, high separator bars defining a space occupied by the light and relatively flexible drop wires, and a plurality ofjaligned oscillating elements one for each set of drop wires to cooperate with fallen drop wires tending to move a fallen dropwire toward a separator bar. 7

10. In a warp stop motion for looms having relatively coarse and relatively fine warp threads, a group of relatively wide drop wires for the coarse warp threads, a separate group of relatively lighter drop wires! for the finer warp threads, means to separate the lighter drop Wires from the wider drop wires, all the drop wires having slots therein witha restricted upper portion, a non-circular oscillating detector rod passing through the slots andrengageable by the restricted portion of the slot of a fallen drop wire, said rod moving a fallen drop wire against the means to cause deflection of a fallen drop wire'when' moved against the means, and means to stop the loom when any of the drop wires fall.

In testimony whereof I have hereunto affiXed my signature.

. JOHN REGAN. 

